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INDIO, CA - APRIL 11: Busta Rhymes performs with Girl Talk onstage during day 1 of the 2014 Coachella Valley Music & Arts Festival at the Empire Polo Club on April 11, 2014 in Indio, California. (Photo by Kevin Winter/Getty Images for Coachella)

Rapper Busta Rhymes was arrested on assault charges after he allegedly threw a protein drink at the back of another man's head at a New York City gym, according to police.

The 43-year-old Brooklyn-born rapper, whose real name is Trevor Smith, was at Steel Gym on West 23rd Street in Chelsea around 8:30 p.m. Wednesday when police say he tossed the drink at the victim.

The bodybuilder said that the employee refused to let Rhymes bring a cameraman in the gym with him on Tuesday, and the two argued the next day when the rapper returned to buy the protein drink. The bodybuilder said Rhymes and the employee splashed one another with water before the bottle was thrown.

NBC 4 New York was not immediately able to reach a representative for the rapper, but he posted a photo to Instagram after the arrest saying he was ready to get back to his recording studio.